"Carreer move for the gynecologist" joke

A gynecologist decides to quit his job to fufill his life long dream of becoming a mechanic. He decides to take mechanic courses and he does so for a couple of months up until he must take the test. The test consists of taking apart a car's engine and putting it together perfectly for a score of 200.

He does his test and feels confident that he did well.

A week later he receives a call,

"This is your regarding your test," The man on the phone says.

"Yes, how did I do?"

"You got 400 over 200"

"400 over 200? how did I get that?"

"You got 100 for taking the motor apart perfectly."

"Ok"

"You got 100 for putting it together perfectly."

"So I got a perfect score? How did I get the other extra 200?"

The man hesitates and answers, "That's for doing it all through the muffler!"